If nature does not provide man with the necessary material, it is the laboratory ____ he will turn to for it.
Not until his father came back ____________ to bed.
The doctor said that maybe his disease is __________ the water he drinks.
It’s an agreement between towns or cities, _______ have similar features, such as industry, culture and entertainment.
Unfortunately, his dog got __________ by the car.
Outside the door ____ an old man, dead. He was terrified!